Effect of Cast-rolling Rate on Microstructure of Al-9Si-0.25Mg Alloy Cast-rolling Sheet
Author of the article:BAO Yujie;LI Yang;WEI Bowen;XU Boyue;XU Guangming
Author's Workplace：School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China
Key Words：eutectic silicon casting-rolling rate casting-rolling grain refinement
Abstract：
The effect of casting and rolling speed on the size and shape of eutectic silicon in Al-9SI-0.25 Mg alloy was studied by using vertical two-roll casting and rolling mechanism to prepare slab in laboratory.The results show that at a low casting and rolling speed of 1 m/min,the morphology of the alloy is needle shaped,the distribution is relatively dispersed,the average aspect ratio is 9.7,and the average length is 3.61μm.With the increase of casting and rolling speed,the size of eutectic silicon decrease obviously.When the casting and rolling speed increased to 20 m/min,the needle-flake eutectic silicon disappeared,and eutectic silicon appeared as fiber,its distribution is relatively concentrated,and the average aspect ratio decrease to 2.1,and the average length decrease to 0.75 μm.However,the reverse segregation of silicon in the macrostructure of cast and rolled sheet is aggravated.
